Typing and printing mechanism for accounting machines and the like



Feb. 7, 1950 3. K. RAINEY 2,496,357

TYPING AND PRINTING MECHANISM FOR ACCOUNTING MACHINES AND THE LIKE 4Sheets-Sheet 1 Filed NOV. 16, 1945 INVENTOR.

CLIFTON KING AINEY. BY 624 o ATTORNEY.

Feb. 7, 1950 c. K. RAINEY 2,496,357

TYPING' AND PRINTING MECHANISM FOR ACCOUNTING MAQHINES AND THE LIKEFiled Nov. 16, 1945 4 Sheets-Sheet 2 FEB.

CL F'TON KINGINEY.

ATTORNEY.

Feb. 7, 1950 c. K. RAINEY TYPING AND PRINTING MECHANISM FOR ACCOUNTINGMACHINES AND THE LIKE 4 Sheets- Sheet 5 Filed Nov. 16, 1945 CL FTON KINGRAINEY.

Feb. 7, 1950 c. K. RAINEY TYPING AND PRINTING MECHANISM FOR ACCOUNTINGMACHINES AND THE LIKE 4 Sheets-Sheet 4 Filed Nov. 16, 1945 INVENTOR.

IFTON KING Alrftx Patented Feb. 7, 1950 TYPING AND PRINTING MECHANISMFOR ACCOUNTING MACHINES AND THE LIKE Clifton King Rainey, Knoxville,Tenn., assignor, by mesne assignments, to Rainey Accounting MachineCompany, Inc., Knoxville, Tenn., a

corporation of Tennessee Application November 16, 1945, Serial No.629,185

4 Claims. 1

This invention relates to typing, printing and computing machines andmore particularly to an improved imprinting action means therefor,although the teachings and concepts thereof may be employed with equaladvantage for other purposes.

It contemplates more especially the provision of a simplified, improved,compact and more durable key structures and action devices for combinedtypewriting and accounting machines, such as illustrated in my UnitedStates Letters Patent No. 2,183,920, issued December 19, 1939.

Instrumentalities for typing, computing and accounting machines arecommon, but these are intricate, involve many parts, and for practicaland commercial reasons are applicable for the most part to elaborateaccounting and similar devices wherein compactness, simplicity of parts,effective imprinting and dependable operation over extended periods havenot been collectively accomplished. In machines involving plural sheetsfor recording impressions and computations of mechanical devices, thefront and back feed visible carriage are respectively very suitable andusually deemed best from a time and labor saving standpoint, intricacyand maintenance and expense being secondary to the results sought. Withthe teachings of the present invention improved typing and printinginstrumentalities are provided for action on plural independent sheetsthat are capable of either front or back visible feed response.Computing machines embodying the teachings of the present invention arecomparatively inexpensive from a structural and production coststandpoint, since very compact, simple, and dependable actions have beenincorporated to make possible the use of minimum and small sturdy partsconducive to producing a comparatively low cost machine.

One object of the present invention is to improve the construction andoperation of devices of the character mentioned.

Another object is to provide an improved and simplified imprintingaction for typing, printing, and computing instrumentalities and thelike.

Still another object is to provide an improved computing section foraccounting machines which is more compact, dependable and effective.

A further object is to provide an improved computing machine printingaction which in- 2 volves few parts, is highly durable, more compact,and less expensive in construction.

Still a further object is to provide improved key actions in conjunctionwith a simple hammer action for multiple keys for more compactness,dependability and effectiveness.

A still further object is to provide an improved printing hammer andtype guide for combined typing and accounting machines.

Other objects and advantages will appear from the. following descriptionof an illustrated embodiment of the present invention.

In the drawings:

Figure l is a fragmentary top plan view of a combined typing andaccounting machine embodying featuers of the present invention.

Figure 2 is a fragmentary sectional view in elevation takensubstantially along broken line 11-11 of Figure 1 with parts broken awayto clarify the showing.

Figure 3 is an enlarged fragmentary front detail View of the camactuator shaft for operating the hammer and other instrumentalitiesviewed from line III-III of Figure 2. I

Figure 4.- is a fragmentary enlarged sectional view in elevation takensubstantially along line IV-IV of Figure 1.

Figure 5 is a fragmentary top plan sectional view taken substantiallyalong line V-V of Figure 2.

Figure 6 is a fragmentary top plan sectional view taken substantiallyalong line VI-VI of Figure 2.

Figure 7 is a fragmentary detail sectional view in elevation of the typebar guide and hammer portion.

Figure 8 is a detail plan view of the combined type bar guide andhammer, parts thereof being shown in sections to clarify the showing.

Figure 9 is a fragmentary sectional View of the computing type baractuators taken substantially along line IX-IX of Figure 1.

Figure 10 is a fragmentary sectional view in elevation takensubstantially along line X-X of Figure 9.

Figure 11 is an enlarged detail side view inelevation of the computingbar follower guide.

Figure 12 is an end View in elevation of the computing bar followerguide shown in Figure 11.

Figure 13 is a sectional view taken substantially along line XIIIXIII ofFigure 11.

Figure 14 is a bottom plan view of the computing type bar follower guideshown in Figure 11.

Figure 15 is a fragmentary sectional view taken substantially along linXVXV of Figure 9.

Figure 16 is an enlarged side'fragmentary detail view of the computingbar, guide follower, and actuator assembly shown in Figures 9 and 15.

Figure 17 is a fragmentary front view in elevation of the lower endportion of a computing type bar.

Figure 18 is a side view in elevation of a complete computing type bar.

Figure 19 is a sectional view in elevation taken substantially alongline XIXQX of Figure 18.

The structure selected for illustration is not intended to serve as alimitation upon the scope or teachings of the invention, but'is merelyillustrative thereof. There may be considerable variations andadaptations of all or part of the teachings depending upon the dictatesof commercial practice. The present embodiment comprisesinstrumentalities mounted on a carriage frame supported by suitabl feetI ll2 to rest on a fiat surface such as a table'or desk. The carriagepaper accordingto'the purpose or purposes for which the mechanismandinstrumentalities have been designed, assembled and integratedirrespective'of theparticular term or terms that may be utilized toidentify the machine or mechanism for illustrative purposes.

A platen roller [5, having a rubber or other suitable tubularcover l6disposed thereover, is fixed to a shaft I! which is .journalled inbearings fixed to 'thesideplates i-3-i4. One or more sheets of paper maybe disposed between the feeding rollers (not shown) and the platen 45-46in a manner specifically illustrated in my co-pending application SerialNo. 580,117, filed February 28, 1945.

The sheets are fed by the platen il6 within the-path of type bar andcomputing bar actuators for the desiredprinting and posting thereon asis customary in known accounting machines.

The entries are usually identified with descriptive indicia along withthe date for each entry effectedwith the usual type printing bars orkeys simulating a standard typewriter mechanism. The posting operationis effected through numeral bars confined in an improved section foroperation by adding and subtracting racks, the latter not being any partof the present invention. The present invention concerns itself with thecombined arrangement'and improved actuation of the type bar andcomputing bar and their operating instrumentalities.

The descriptive type bars are collectively construed as a typewritertype bar segment to comprise the usual'number and arrangement of typebars '8 simulating the make-up of the usual and customary standardtypewriter, and are pivoted as at l9 within the radially slotted arcuatemount 20 supported by the frame I 0 in the customary manner. The typebars l8 are impressed in re lief with the usual upper and lower caseindicia 2 l-22 formed on substantially rectangular plates 23. Theindicia plates 23 are suitably attached to correspondingly sized andshaped projections 24 that are laterally offset from and attached to thefree extremities 25 of the type bars !8. The

usual felt supports 26 serve as a rest for the type relation.

bar projections 24, these being sustained by a substantially L-shapedarcuate bar 21 fixed to the frame It) adjacent the forward wall 28thereof.

The type bars 18 have a downwardly oifset ear 28 at their pivotedextremity for attachment of a rod link 30 thereto. The rod link 30extends to and pivotally connects with the free extremity 3| of the linkplate 32 pivoted as at 33 within slots 34 depending from the arcuatebracket 21. The link plate 32 is actuated by a vertical rod link 35 andis pivotally connected therewith as at 35 to the central region thereoffor operative connection as at 38 to an actuator key arm 37 by reason ofthe laterally pivotal connection with the lower extremity of thevertical rod link 35. The key arm 3! corresponds in number with the typebars 38, and the former are pivotally connected at their-inwardhorizontal extremity 39 to a transverse bracket 40 fixed to the frameIll.

The springs 4| are anchored at one extremity 42 to the key arms 3?, toextend upwardly for anchored connection to the frame It as at 43 inorder to normally impart an upward urge to the key arms 37 to maintainthem in their extreme clock-wise position (viewed from Figure 2) andthereby sustain the key arms 31 in their normally horizontal initialposition. The key arms 31 terminate forwardly in an upwardly offsetshank 44 which have circular letter and number indicating indiciaconfining circular key frames 45 attached thereto to correspond with theindicia 2|--22 formed in relief on the supporting plate 23. The typebars i 8 are displaceable in a clockwise direction responsive to thedownward finger tip displacement of the key indicia frames 45 thattransmits the displacement to the key arm 31 which, in turn, actuatesthe key bar It in a clock-wise direction for striking with impact at acommon ribbon frame and site to imprint paper disposed between the feedrollers (not shown) and the platen i5-l6 in a manner similar to theoperation of a standard typewriter.

The key bars l8 operating responsive to the depression of the key arms3'! coordinate their imprinting with an adding and substracting barsegment 45 (Figure 5) consisting, in this instance, of side platemembers 41-48 having top and bottom cross members 4B5il, respectively,disposed therebetween to maintain the side plates 41-48 in fixed spaceparallel relation. The adding and subtracting bar segment 46 isgenerically referred'to herein as a computing segment. The top crossmember 49 is of substantially U-shaped configuration (Figure 5) and issecured in position by means of suitable fasteners such as machinescrewsiil', in this instance two, which maintain a plurality ofvertically disposed slide guide plates 5! in horizontal parallel spacedThe'verti'cal plates 5| correspond in number to the adding'bars which,in this instance, are ten in number to present a corresponding number ofnumeral digits as will appear more fully hereinafter. It shouldbe'observed that the upper'and-lower extremities of'the slide guideplates'5l are provided With substantially rectangular notches to receivethe upper and lower cross members-49-50 which are press fitted therein.

Each vertical slide guide plate '5! is provided with a bar followerguide'52 (Figures 2 and 11) comprising, in this instance, asubstantially rectangular frame having inwardly extending vertical sidemembers'53-54 disposed between laterally projecting end members555$ topresent a vertical slide groove?! (Figure 14) complemental to eachvertical plate 5|. This arrangement also provides a horizontal camfollower guide groove 58 (Figure 12) to receive the cam end of anactuator lever of the computing type bar segment 46 to be hereinafterdescribed. One of the side members 53 of each bar follower guide 52 isprovided with an ear 59 having an aperture 60 provided transverselytherethrough for pivotal connection of the lower extremity 6| of anelongated adding bar shank 62. The pivotal connec tion is effectedthrough a pin 63 that extends through the lower apertured end 6| of thebar adding shank 62 for establishing pivotal connection with the ear 59.

The adding bar shank 62 comprises, in this instance, part of the tendigit computing type bar segment 46. Each adding bar shank 62 extendsupwardly to provide a laterally extending imprinting face 64 whereonnumeral indicia 65 from zero to nine to 9) reading downward are cast,engraved, or otherwise formed thereon in relief from the top to thebottom in sequence. The laterally extending face plate 64 presents asubstantially T-shaped adding type bar 62 (Figure 19) each of which ispivotally connected to the follower guides 52 (Figure 16) for verticaldisplacement along the plates serving as a slid guide for the followerguides 52. The adding machine bar shanks 62 are each provided with anangularly offset fiat spring 66 anchored as at 61 to the rearward edgeof the bar shank 62 for downward projection between the lower bar shankextremity 6| and the adjacent edge 68 of the upper cross member 55provided on each of the bar follower guide frames 52 (Figure 16). Theflat springs 66 normally urge the adding bars 62 in a counter-clockwisedirection (viewed from Figure 9) against the forward plate 69 (Figures 2and 4) to maintain them in true vertical alignment in their initialinoperative position. The forward plate 69 is attached between the sideplate 41-48 of the adding type bar segment 46 to vertically align withthe upper wall 18 of the arcuat mount of the pivoted type bars l8.

It should be noted that the adding bars 62 are of substantially T-shapedcross-section and contact each other along the adjacent edges of theirlaterally offset face plates 64. The shanks 62 thereof slide throughcorrespondingly shaped and sized slots H provided in a horizontal bar 12(Figure 5) provided between the side plates 41-48 of the adding keysegment 46. The bar follower guides 52 also contact each other alongtheir adjacent edges presented by the opposing surfaces of the laterallyprojecting end frame members 55-56 thereof to afford a compact segmentof free sliding elements that are displaced by improved cam type leveractuators 73 (Figures 2 and 9) which serve to reciprocate the barfollower guides 52 vertically along the guide plates 5|. In order toaccomplish this without pins or pintles such as is customary forcomputing key segments, the lever actuators 13 each comprise an arm 14having an integral circular boss conforming to and complemental of acircular bearing and spacer 15 disposed adjacent thereto to serve as apivotal mounting and contacting bearing therefor.

To this end, the circular bearing and spacer plate 15 is in registrywith the enlarged boss end of the lever arm 14 which is part of anormally offset shorter arm '16 formed integral therewith. The relationof the actuator lever arms 14-16 present a substantially increasedoscillatory displacement of the operating end of the actuator lever arm14 proportional to the increased length thereof over the shorter arm 16.The circular bearing 15 is axially apertured therethrough as at H forjournaled support on a shaft 18 (Figures 1 and 2) which is mounted inthe frame I0 between the side plates 41-48 of the segment 46. Collars19-88 (Figure 1) are fixed to the.

shaft 18 to retain the circular bearing and con tacting plate 15 of theactuators 13 in assembled contacting relation, there being an actuator13 for each of the follower guides 52.

The longer lever arm I4 of the actuator 13 converges to merge in asubstantially circular cam 8| having rounded sides 82-83 and a flat end84. The rounded ends 82-83 of the cam 8| are diametrically opposite eachother and possess a diameter slightly smaller than the cam followerguide groove 58 and precision fit therein to enable the relative slidingand rotary movement therewith responsive to the oscillatory displacementof the actuator 13 as will be apparent from the full anad dottedoutlines of the actuator 13 (Figure 9).

It should b observed that the actuator lever cams 81 are of no greaterthickness than the follower guide 58 so that the adjacent correspondingelement confine each other against lateral displacement to provide acompact and durable operating connection between the relatively movingparts and improved operating characteristics. Thus, the usual mountingpins which require space and present, at best, intricate assembly andmaintenance problems are totally eliminated. The function of theactuator 13 is to index the position of the adding keys or bars 62responsive to adding and subtracting racks (not shown) that do notconstitute a part of this disclosure.

It should be noted that the free extremity of the shorter actuator arm16 also converges to terminate in a circular cam 85 which hasdiametrically opposite circular portions 86-81 and a substantially flatend 88. The fiat end 88 is, in this instance, notched as at 89 foroperative connection with the calculating mechanism (not shown) topresent the operating characteristic of precluding the zeros of theindicia to appear in front of the extreme left digit and thus avoid theprinting thereof as a prefix digit. The shorter actuator arm 16 of eachactuator 13 provides its cam in the path of a rack bar 90 (Figure 2)that serves to return the actuator 13 and its operatively connected bars62 to their initial position. Coil springs 9| are anchored as at 92 toeach of the actuator arms 16, with their other extremity anchored at 93to the side plate 48 of the adding key segment 46 to normally urge theactuator 16 in a clock-wise direction (viewed from Figure 2).

After the calculating mechanism has pre-determined the position of theadding bars 62 of computing segment 46, it becomes necessary toeffectuate the printing of the numerals in line with the printing sightthrough a ribbon that is common to the type bars l6 and the adding bars62. To this end, a hammer mechanism 94 is provided for all of the addingbars 62. The hammer mechanism 94 consists, in this instance, of a rod 95that is disposed between the extremities 96 of mounting arms 91-98(Figures 4 and 8). The extremities 96 which carry the hammer rod 95, areoffset from their supporting arms 91-98 that extend downwardly forpivotal mounting as at 99-!!! to the side plates 41-48 7 of the addingsegment 46 (Figure 6). Suitable fasteners such as machine screws IOIextend through the hammer arm extremities 96 for axial engagement of thehammer rod 95 to rigidly support the latter forwardly of the adding bars62 in impacting relation therewith when the adding keys or bars 62 areelevated in the path thereof from their initial lowered position, fordisplacing the keys 62 against the platen I--I 6 with an impacting forceresponsive to instrumentalities to be hereafter described.

The hammer supporting arms 9'l-98 extend downwardly beyond the pivotmount 99-400 to present reduced extensions I02 that carry a rod I03therebetween for attachment by axially engaging machine screws I04. Anannular groove I05 in the rod I633, receives the looped extremity I08 ofa coil spring Iiil which is anchored at its other extremity to an eyeletiii-8 (Figure 2) provided with a threaded shank 509 which extendsthrough the type key mount 40 for engagement by a threaded nut H0. Withthis arrangement, the tension in the coil spring IUI may be adjusted tonormally urge the hammer rod 35 in the clockwise direction (viewed fromFigure 4) with the lower edges III (Figure 4) of the hammer arms 97normally in contact with actuating cams [I2 (Figures 3 and 4) in edgealignment with the hammer arm edges I I I.

The cams i I2, in this instance two, are mounted on a cam shaft H3(Figures 3 and 4) which, in turn, are journaled for rotary support inthe frame it for operation responsive to an electric motor (not shown).The cams H2 have a low portion H4 and a high point H4 which effectuatesthe extreme impacting displacements of the hammer rod 95 against any ofthe adding bars 62 which are set upwardly in the path thereof by thecalculating mechanism (not shown). Normally, the adding bars 62 aredisposed below the path of the hammer rod 95 which are rockably mountedthrough its arms 97 on the pintles SSS-I88. Another set of cams IE5(Figure 3). in this instance two, are mounted on the cam shaft I I3 tooperate the restoring bars I I5 in timed re-- lation with the cams l I2.

In order for the hammer rod 95 to serve the dual function as a guide forthe type bars 18, the hammer rod 95 is slotted as at H5 in alignmentwith the printing frame to present upstanding, confronting and forwardlyextending flanges II'I which are spaced to provide rearwardly convergingsurfaces I I8 that merge with the slot I I6 for the reception of therearwardly offset type bar extremity 25 serving to cooperate with theguide groove IE6 and confronting flanges II! to insure a proper strikingposition for the type bars or keys I8. Thus, a single hammer rod 95serves to impart impact to all of the adding bars 62 and also serves asa guide for all of the type bars I8 to insure the proper indexing of theimprinting operation for both the type bars I8 and the adding bars 82.It will be observed, therefore. that the number of parts has beenminimized with the result in saving and space, production expense, andimproved facility of operation with greater dependability.

The carriage within which the platen I5-IG is rotatively mounted, ishorizontally spaced by means of the usual typewriter carriage spacingmechanism. The carriage is confined for guidance in confronting V-shapedguide blocks II9I20 which have the usual confronting racks I2I-I22(Figures 1 and 2) provided thereon to properly space the carriageresponsive to the operation of the typing and computinginstrumentalities. While the calculating mechanism has not been shown, abrief description of the functional elements of the illustratedstructure makes reference to certain associated standard calculatingelements with which those skilled in the art are familiar. Thisreference renders the instant disclosure understandable to those skilledin the art, and will enable a greater appreciation for the improvementsconstituting the subject matter of the present invention.

It should be noted that for indexing purposes, the numeral keyscomprising part of the standard set of type bars I8 make one-half oftheir normal downward motion and hit a bar for indexing purposes withoutimprinting. This effects the punching of the indexing pins to space thestop box one position to operate a full set of pins for any one numberof a group. To imprint the numbers without adding or subtracting, itshould be observed that the stop box is ordinarily one space laterallyof the rack bar. The motor for operating restoring levers will thenoperate the stop box to set at one column to the right of the indexingfinger. With the instrumentalities in their initial position, the hammeroperating cams II2 have their low point contacting the hammer operatingarms 91. The larger cams II5 which control the restoring bars effect thecamming edge extending rearwardly with the restoring bars back as far asthey can be displaced. Then the motor bar that is readily accessiblefrom the type keyboard, is manually tripped and lifts the built-in motorclutch release to make electrical contact to initiate a full revolutionof the motor clutch shaft. In the first part of this action, the hammerrod is moved forward from the platen I5-I6 to allow enough space for theadding type bars 62 to rise. The position of the bars 62 are pre-set bythe calculating mechanism to enable the elevation thereof through theinfluence of the actuator springs 9| to serve as the lifting influencethereon within the limits set by a stop box of standard or any suitableconstruction.

When the motor has turned the cam shaft H3 one-half revolution, theadding type bars 62 have arrived at their upper limit of movementaccording to the indexing pins set in the stop box, the lattercomprising a part of the calculating mechanism (not shown), the cams II2operate the hammer to cause the type bars 62 to be impacted against theribbon at the printin frame sight to effect the printing on the sheetthat is disposed against the platen I5I6. Now, then, with the start ofthe second half of the revolution of the cam shaft I I3, the hammer 95is moved forward, the restoring bars are then in a position to shift theadding wheels in mesh with the racks which are limited to correspondingpositions of the type bars. As the cams II5 revolve further, therestoring bars II5 are pushed rearwardly, pulling the rack mechanism tothe rear and the type bars are synchronously pulled down to theirinitial position. After the type bars are restored to their initial lowposition, the cam II2 permit the hammer to move rearwardly under theinfluence of the spring II" to the initial position as a type bar guide.This briefly traces a cycle of operation commensurate with a fullrevolution of the motor which is automatically rendered inactive at theend of each revolution by its own built-in throw-out clutch.

While I have illustrated and described a preferred embodiment of thisinvention, it must be understood that the invention is capable ofconsiderable variation and modification without departing from thespirit of the invention. I, therefore, do not wish to be limited to theprecise details of construction set forth, but desire to avail myself ofsuch variations and modifications as come within the scope of theappended claims.

I claim:

1. In a device of the character described, the combination with a frame,of a carriage movaloly mounted on said frame, a platen on said carriage,a computing type loar segment on said frame, a typewriter type barsegment on said frame, a plurality of computing type lbars included insaid first named segment, a plunality of typewriter type pars includedin said second named segment, means for independently positioning eachof said computing and typewriter pars relative to said platen, and acombined hammer and par guide coextensive with all or said computing andtypewriter type bars to respectively effect the printing of computingtime bars and the guidance of typewriter type ibars toward said platen.

2. In a device of the character described, the combination with a frame,of a carriage movably mounted on said frame, a platen on said carriage,a computing type par segment on said frame, a typewriter type lcarsegment on said frame, a plurality of computing type lbars included insaid first named segment, a plurality of typewriter type lbars includedin said second named segment, means for independently positioning eachof said computing and typewriter pars relative to said platen, acombined hammer and typewriter type ibar guide common to all of saidcomputing and typewriter type bars, and means adapted to operate saidhammer relative to said computing type par segment and terminate theoperation thereof independent of any translation to said carriage toeffect the printing of the positioned computing type bars against saidplaten,

said hammer having means thereon for the guidance of typewriter typebars toward said platen when said hammer is inactive with respect tosaid computing type per segment.

3. In a device of the character described, the combination with a frame,of a carriage movaloly mounted on said frame, aplaten on said carriage,a computing type lbar segment on said frame, a typewriter type barsegment on said frame, a plurality of typewriter loars pivotallyconnected to said last named segment for displacement to a commonprinting point, a plurality of computing type bars, slidaple fol-lowerguide pivotally associated with said computing type lbars, parallelguide plates in said computing type loar segment iflOI' slidalblyreceiving computing type :bar follower guides, actuating lever camsoperatively connected to each of said computing type par follower guidesto linearly displace said computing type pars, said slidalble followerguides comprising a frame having oppositely open and normally disposedgrooves, one of. said grooves serving to slidaloly mount said parallelguide plates,

the other of said grooves serving to linearly and rotatively receive thelever cams therein to linearly displace said cam follower guide alongsaid parallel guide plates responsive to the oscillation oi said levercams, and a hammer coextensive with all of said computing type bars oimpact the latter against said platen, there being a transverselyflanged cut-out in said hammer to guide the typewriter type bars to thetyping point above said typewriter type Hoar segment.

4. In a device of the character mentioned, the combination with a frame,of a carriage on said frame, a computing type bar segment, a pluralityof differentially positionable computing type bars in said segment,means for verticall positioning said computing type bars in saidsegment, a printing hammer coextensive with said computing type ibarsegment to confront all of said computing type bars positioned thereinfor imprinting movement toward said platen, spring means for normallyurging said printing hammer against said platen, a typewriting key parse ment, a plurality of typewriting key bars in said last named segment,means for selectively displacing said typewriting key lbals toward saidplaten to imprint against said platen albove said printing hammer, atypewriter key bar guide on said hammer to define the printing positionof said typewriter key pars therewith when said printing hammer is inits normally inoperative position, and cam means for retracting saidprinting means against the urge of said spring means, said cam meanshaving an abrupt tripping portion thereon to impact said printing hammerunder the urge of said spring means against the positioned computing keybars in the direction of said platen to effect the printing operation,whereby said hammer serves as a guide for said typewriter key bars andas a hammer for said computing type tears in a selected sequence ofoperationsrelative to said platen.

CLIFTON KING RAINEY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date Re. 15,985 Schafier Jan. 20, 1925780,271 Felt Jan, 17,.1905 1,033,932 Raloer July 30, 1912 1,053,943Dorman Feb. 18, 1913 1,340,864 Waldheim May 18, 1920 1,471,654 Graf Oct.23, 1923 1,975,808 .Sundstrand Oct. 9, 1934 2,131,918 Mills Oct. 4, 19382,183,920 Rainey Dec. 19, 1939 2,264,855 Pasinski Dec. 2, 1941 2,399,724Dil-ling May 7, 1946 FOREIGN PATENTS Number Country Date 423 569 GreatBritain Feb. 4, 1935

